Air Manifold Heater - draining battery

Peliancho

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hi, i am newbie on this site and have just been reading threads on battery drainage. i have a 30amp/h drain on my C220 CDI at the moment which my mechanic has, after five days, diagnosed as being a fault in the air manifold heater. Most of the threads i have read on battery drains refer to a problem with the water jacket heater but make no reference to any air manifold heater.
Is anyone out there able to guide me in terms of what an air manifold heater does, can i run without it in warm weather, and could my problem be linked to the more popular water jacket heater saga?
just the three questions then.
any guidance much appreciated, thanks
 

television

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2002 SL500, 216 CL500, all fully loaded
Hello and welcome. this is the pre heater and I believe that you can leave it off
 
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